Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f963f449bbecdf0…

MALICIOUS

PDF

72.3 KB Created: 2020-09-18 14:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce048d15cc74330233b2e888b4adda7 SHA-1: 00db1fe55c5648c87ac5e4d844d3c702d6a5d33b SHA-256: 9f963f449bbecdf06f7ba208dfe84dd956e56b1c88e47c582a68d8ce3237865e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with a critical heuristic firing on a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text fragments and the target URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to the ttraff.me domain for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=aa+step+6+7+worksheets
    • http://files.tourdestreescanada.com/uploads/1/3/1/4/131438282/9bbd735be.pdf
    • http://files.flywa.com.au/uploads/1/3/1/6/131606491/5cabfe3f2d.pdf
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdf
    • http://files.gunillaoffmarket.com/uploads/1/3/2/6/132681690/f1c5d.pdf
    • http://files.mclellandshoes.com/uploads/1/3/2/7/132710711/jiremowewoje-jilunuso-pixafogemojunin-pinuxulogizik.pdf
    • https://cdn.shopify.com/s/files/1/0486/2817/0917/files/the_four_motion_diagrams_below_show_an_initial_point_0_and_a_final_point_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/bawolujativexave.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/sintesis_protein.pdf
    • https://84d1550a-255b-4d30-b1cf-c174426c7e55.filesusr.com/ugd/696117_52ec98439a204ea9a5d88654fcc2da20.pdf?index=true
    • https://52ccf930-c183-45e6-b2e7-81947cbaf126.filesusr.com/ugd/607883_408a8b57311d47cdb55844ac83617d0b.pdf?index=true
    • https://50bbfb14-7391-469f-8af3-2ac24f022a4e.filesusr.com/ugd/54b9a1_9fc1871ef2f2465ea70150de88797487.pdf?index=true
    • https://1f66d598-8b77-49f0-979c-1b37b499476c.filesusr.com/ugd/565485_3383f17b83c54666b8785a467cefe963.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d149.bin
7ae25bb17327d4fa7b3686669c45c05785b7d3c7ff901c1b7c015975a99c77fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 4888 bytes
font_01_sfnt_off0000e20f.bin
0735eae8e9ae8aadaaef045d948d5d2b2877c5697f49ae1526881b97263f1aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 10632 bytes
font_02_sfnt_off00010620.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 4324 bytes

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